The question goes as follows
"Find the coodinates and the nature of any stationary points on the following
y=4x-5e^x"
I know the general method, what got me was when you try to solve for x after differentiating it. When I differentiated I ended up with "4-5e^x=0" I thought I could use logs, but I don't want to become dependant on that method since C3 is a non calculator paper. Can anyone help me on this part of the question?